Strong out-of-plane magnetic anisotropy in ion irradiated anatase TiO2 thin films
Source abstract
Abstract
The temperature and field dependence of the magnetization of epitaxial, undoped anatase TiO2 thin films on SrTiO3 substrates was investigated. Low-energy ion irradiation was used to modify the surface of the films within a few nanometers, yet with high enough energy to produce oxygen and titanium vacancies. The as-prepared thin film shows ferromagnetism which increases after irradiation with low-energy ions. An optimal and clear magnetic anisotropy was observed after the first irradiation, opposite to the expected form anisotropy. Taking into account the experimental parameters, titanium vacancies as di-Frenkel pairs appear to be responsible for the enhanced ferromagnetism and the strong anisotropy observed in our films. The magnetic impurities concentrations was measured by particle-induced X-ray emission with ppm resolution. They are ruled out as a source of the observed ferromagnetism before and after irradiation.
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Research context
OpenAlex topics: ZnO doping and properties · Electronic and Structural Properties of Oxides · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of Leipzig 1 Division of Superconductivity and Magnetism, Institute for Experimental Physics II, , 04103 Leipzig, Germany
University of Leipzig 2 Division of Nuclear Solid State Physics, Institute for Experimental Physics II, , 04103 Leipzig, Germany
University of Leipzig 3 Semiconductor Physics Group, Institute for Experimental Physics II, , 04103 Leipzig, Germany
Funding
Deutsche Forschungsgemeinschaft
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